Long noncoding RNAs HAND2-AS1 ultrasound microbubbles suppress hepatocellular carcinoma progression by regulating the miR-873-5p/tissue inhibitor of matrix metalloproteinase-2 axis

BACKGROUND Increasing data indicated that long noncoding RNAs(lncRNAs)were directly or indirectly involved in the occurrence and development of tumors,including hepatocellular carcinoma(HCC).Recent studies had found that the expression of lncRNA HAND2-AS1 was downregulated in HCC tissues,but its role in HCC progression is unclear.Ultrasound targeted microbubble destruction mediated gene transfection is a new method to overexpress genes.AIM To study the role of ultrasound microbubbles(UTMBs)mediated HAND2-AS1 in the progression of HCC,in order to provide a new reference for the treatment of HCC.METHODS In vitro,we transfected HAND2-AS1 siRNA into HepG2 cells by UTMBs,and detected cell proliferation,apoptosis,invasion and epithelial-mesenchymal transition(EMT)by cell counting kit-8 assay,flow cytometry,Transwell invasion assay and Western blotting,respectively.In addition,we transfected miR-837-5p mimic into UTMBs treated cells and observed the changes of cell behavior.Next,the UTMBs treated HepG2 cells were transfected together with miR-837-5p mimic and tissue inhibitor of matrix metalloproteinase-2(TIMP2)overexpression vector,and we detected cell proliferation,apoptosis,invasion and EMT.In vivo,we established a mouse model of subcutaneous transplantation of HepG2 cells and observed the effect of HAND2-AS1 silencing on tumor formation ability.RESULTS We found that UTMBs carrying HAND2-AS1 restricted cell proliferation,invasion,and EMT,encouraged apoptosis,and HAND2-AS1 silencing eliminated the effect of UTMBs.Additionally,miR-873-5p targets the gene HAND2-AS1,which also targets the 3’UTR of TIMP2.And miR-873-5p mimic counteracted the impact of HAND2-AS1.Further,miR-873-5p mimic solely or in combination with pcDNA-TIMP2 had been transformed into HepG2 cells exposed to UTMBs.We discovered that TIMP2 reversed the effect of miR-873-5p mimic caused by the blocked signalling cascade for matrix metalloproteinase(MMP)2/MMP9.In vivo results showed that HAND2-AS1 silencing significantly inhibited tumor formation in mice.CONCLUSION LncRNA HAND2-AS1 promotes TIMP2 expression by targeting miR-873-5p to inhibit HepG2 cell growth and delay HCC progression.

High matrix metalloproteinase-9 expression induces angiogenesis and basement membrane degradation in stroke-prone spontaneously hypertensive rats after cerebral infarction

Basement membrane degradation and blood-brain barrier damage appear after cerebral infarc- tion, severely impacting neuronal and brain functioning; however, the underlying pathogenetic mechanisms remain poorly understood. In this study, we induced cerebral infarction in stroke- prone spontaneously hypertensive rats by intragastric administration of high-sodium water （1.3% NaC1） for 7 consecutive weeks. Immunohistochemical and immunofluorescence assays demonstrated that, compared with the non-infarcted contralateral hemisphere, stroke-prone spontaneously hypertensive rats on normal sodium intake and Wistar-Kyoto rats, matrix metalloproteinase-9 expression, the number of blood vessels with discontinuous collagen IV expression and microvessel density were significantly higher, and the number of continuous collagen IV-positive blood vessels was lower in the infarct border zones of stroke-prone sponta- neously hypertensive rats given high-sodium water. Linear correlation analysis showed matrix metalloproteinase-9 expression was positively correlated with the number of discontinuously collagen IV-labeled blood vessels and microvessel density in cerebral infarcts of stroke-prone spontaneously hypertensive rats. These results suggest that matrix metalloproteinase-9 upregula- tion is associated with increased regional angiogenesis and degradation of collagen IV, the major component of the basal lamina, in stroke-prone spontaneously hypertensive rats with high-sodi- um water-induced focal cerebral infarction.

Matrix metalloproteinase-9 and tissue inhibitor of metalloproteinase-1 expression in early focal cerebral infarction following urokinase thrombolysis in rats

Activity of matrix metalloproteinase-9 increases following cerebral ischemia/reperfusion, and is associated with cerebral microvascular permeability, blood-brain barrier destruction, inflammatory cell infiltration and brain edema. Matrix metalloproteinase-9 also likely participates in thrombolysis. A rat model of middle cerebral artery infarction was established by injecting autologous blood clots into the internal carotid artery. At 3 hours following model induction, urokinase was injected into the caudal vein. Decreased neurological severity score, reduced infarct volume, and increased expression of matrix metalloproteinase-9 and tissue inhibitor of metalloproteinase-1 were observed in the cerebral cortex 24 hours after urokinase thrombolysis. These results suggest that urokinase can suppress damage in the acute-early stage of cerebral infarction.

Macrophage-derived matrix metalloproteinase-1 enhances aortic aneurysm formation in transgenic rabbits

Increased expression of matrix metalloproteinase-1(MMP-1)has been observed in the lesions of atherosclerosis and aneurysms;however,it is not fully understood whether macrophage-derived MMP-1 affects these diseases.To investigate whether macrophage-derived MMP-1 participates in the development of vascular diseases,we generated transgenic(Tg)rabbits expressing human MMP-1 in the monocyte/macrophage lineage under the control of the human scavenger receptor enhancer/promoter.Tg rabbits exhibited no visible abnormalities throughout their bodies.Western blotting analysis revealed that the amount of MMP-1 proteins in the conditioned media secreted from peritoneal macrophages of Tg rabbits was up to 3-fold higher than that in non-Tg rabbits.For the first experiment,Tg and non-Tg rabbits were fed a cholesterol diet for 16 weeks,and aortic and coronary atherosclerosis were evaluated.The gross lesion area of aortic atherosclerosis in Tg rabbits was not significantly different from that in non-Tg rabbits,but Tg rabbits had marked destruction of the medial elastic lamina of the aortic lesions on microscopic examination.For the second experiment,we generated aortic aneurysms by incubating with elastase.Compared with non-Tg rabbits,Tg rabbits exhibited a significantly greater aortic dilation.Increased macrophage-derived MMP-1 led to increased medial destruction in both aortic atherosclerosis and aneurysms.These results demonstrate that MMP-1 plays a different role in the pathogenesis of atherosclerosis and aneurysms.

Imbalance of matrix metalloproteinase-9 and matrix metalloproteinase tissue inhibitor-1 may contribute to hemorrhage in cerebellar arteriovenous malformations

In this study, we determined the expression levels of matrix metalloproteinase-2 and -9 and matrix metalloproteinase tissue inhibitor-1 and -2 in brain tissues and blood plasma of patients undergoing surgery for cerebellar arteriovenous malformations or primary epilepsy （control group）. Immunohistochemistry and enzyme-linked immunosorbent assay revealed that the expression of matrix metalloproteinase-9 and matrix metalloproteinase tissue inhibitor-1 was significantly higher in patients with cerebellar arteriovenous malformations than in patients with primary epilepsy. The ratio of matrix metalloproteinase-9 to matrix metalloproteinase tissue inhibitor-1 was significantly higher in patients with hemorrhagic cerebellar arteriovenous malformations compared with those with non-hemorrhagic malformations. Matrix metalloproteinase-2 and matrix metalloproteinase tissue inhibitor-2 levels were not significantly changed. These findings indicate that an imbalance of matrix metalloproteinase-9 and matrix metalloproteinase tissue inhibitor-I, resulting in a relative overabundance of matrix metalloproteinase-9, might be the underlying mechanism of hemorrhage of cerebellar arteriovenous malformations.

Expressions of matrix metalloproteinase-9 and tissue inhibitor of metalloproteinase-1 in malignant peripheral nerve sheath tumor

BACKGROUND： Matrix metalloproteinase-9 （MMP-9） can degrade collagen IV （the main structural ingredient of basilar membrane）, and it also plays an important role in tumor vascularization, tumor cell progression, formation of metastatic focus, etc. Tissue inhibitor of metalloproteinase-1 （T1MP-1） can bind with MMP-9 to form 1 ： 1 compound and inhibit its activity, and can negatively regulate the tumor progression and metastasis. OBJECTIVE： To analyze the relationship of MMP-9 and T1MP-1 expressions with the pathological grade, metastasis and prognosis of malignant peripheral nerve sheath tumor （MPNST）. DESIGN： An observational comparative experiment. SETTING： Heze Medical College. PARTICIPANTS： Fifty-eight surgical pathological samples, which were clearly diagnosed to be MPNST, were collected from the pathological laboratory archives in the Department of Pathology, Heze Municipal Hospital from January 1988 to December 2003. The MPNST pathological types were common tumor in 53 cases, malignant triton tumor in 2 cases, epithelial MPNST in 2 cases and MPNST with gland differentiation in 1 case. The pathological grade was grade 1 in 11 cases, grade 2 in 24 cases and grade 3 in 23 cases. Besides, the resected tumor samples of 20 patients with benign peripheral nerve tumor （10 cases of nerve sheath tumor and 10 cases of neurofibromatosis） and the normal peripheral nerves （by-products of some surgeries） of 5 patients were also collected. The samples were used with the approval of the patients. Rat-anti-human MMP-9, TIMP-1 monoclonal antibody and S-P kit were purchased from Fuzhou Maixin Biotechnology, Co.,Ltd. METHODS： The documented paraffin blocks were again prepared to sections of 5 lJ m. The expressions of MMP-9 and TIMP-1 in the samples were detected with mmunohistochemical S-P method. The relationships of the MPNST severity, recurrence, metastasis and survival rate with the expressions of MMP-9 and TIMP-1 were analyzed. MAIN OUTCOME MEASURES： Relationships of MMP-9 and TIMP-1 expressions with the MPNST severity and prognosis. RESULTS： ①Expressions of MMP-9 and TIMP-1 in three tissues： MMP-9 and TIMP-1 stainings were mainly observed in cytoplasm. Among the 58 MPNST patients, the MMP-9 expression was significantly higher than those in normal peripheral nerve and benign tumor （P 〈 0.05）, while the TIMP-1 expression in MPNST was lower than those in normal peripheral nerve and benign tumor （P 〈 0.05）. ②Relationship of MMP-9 and TIMP-1 expressions with the severity and prognosis of MPNST： The expressions of both proteins were observed in the four subtypes. The positive expression of MMP-9 in the MPNST patients of grades 2 - 3 was significantly higher than that in the MPNST patients of grade 1 （P 〈 0.05）, while the expression of MMP-9 was significantly lower than that in the MPNST patients of grade 1 （P 〈 0.05）. The metastatic rate was positively correlated with MMP-9 expression （r =1.696, P 〈 0.05）, but negatively correlated with TIMP-1 expression （r = - 2.125, P 〈 0.05）. CONCLUSION： MMP-9 and TIMP-1 are associated with MPNST pathological grades and metastasis, and can be used as the indicators for judging the severity and orognosis of MPNST.

Diabetes-related intestinal region-specific thickening of ganglionic basement membrane and regionally decreased matrix metalloproteinase 9 expression in myenteric ganglia

BACKGROUND The importance of the neuronal microenvironment has been recently highlighted in gut region-specific diabetic enteric neuropathy. Regionally distinct thickening of endothelial basement membrane(BM) of intestinal capillaries supplying the myenteric ganglia coincide with neuronal damage in different intestinal segments. Accelerated synthesis of matrix molecules and reduced degradation of matrix components may also contribute to the imbalance of extracellular matrix dynamics resulting in BM thickening. Among the matrix degrading proteinases, matrix metalloproteinase 9(MMP9) and its tissue inhibitor(TIMP1) are essential in regulating extracellular matrix remodelling.AIM To evaluate the intestinal segment-specific effects of diabetes and insulin replacement on ganglionic BM thickness, MMP9 and TIMP1 expression.METHODS Ten weeks after the onset of hyperglycaemia gut segments were taken from the duodenum and ileum of streptozotocin-induced diabetic, insulin-treated diabetic and sex-and age-matched control rats. The thickness of BM surrounding myenteric ganglia was measured by electron microscopic morphometry. Wholemount preparations of myenteric plexus were prepared from the different gut regions for MMP9/TIMP1 double-labelling fluorescent immunohistochemistry. Post-embedding immunogold electron microscopy was applied on ultrathin sections to evaluate the MMP9 and TIMP1 expression in myenteric ganglia and their microenvironment from different gut segments and conditions. The MMP9 and TIMP1 messenger ribonucleic acid(m RNA) level was measured by quantitative polymerase chain reaction.RESULTS Ten weeks after the onset of hyperglycaemia, the ganglionic BM was significantly thickened in the diabetic ileum, while it remained intact in the duodenum. The immediate insulin treatment prevented the diabetes-related thickening of the BM surrounding the ileal myenteric ganglia. Quantification of particle density showed an increasing tendency for MMP9 and a decreasing tendency for TIMP1 from the proximal to the distal small intestine under control conditions. In the diabetic ileum, the number of MMP9-indicating gold particles decreased in myenteric ganglia, endothelial cells of capillaries and intestinal smooth muscle cells, however, it remained unchanged in all duodenal compartments. The MMP9/TIMP1 ratio was also decreased in ileal ganglia only. However, a marked segment-specific induction was revealed in MMP9 and TIMP1 at the m RNA levels.CONCLUSION These findings support that the regional decrease in MMP9 expression in myenteric ganglia and their microenvironment may contribute to extracellular matrix accumulation, resulting in a region-specific thickening of ganglionic BM.

Rosiglitazone uppresses lipopolysaccharide-induced matrix metalloproteinase-2 activity in rat aortic endothelial cells via rasMEK1/2 signaling

ix metalloproteinase(MMPs) plays a key role in the pathogenesis of chronic inflammatory disease,such as atherosclerosis.Among MMPs,MMP-2 is regarded as a major proteinase in atherosclerotic plaque lesions.Peroxisome proliferator activated receptor-gamma(PPARg) ameliorates oxidative stress and the inflammatory response.The aim of the present study was to evaluate the effect of Rosiglitazone on Lipopolysaccharide(LPS)-induced MMP-2 activation as well as its possible mechanism.LPS-induced MMP-2 activity was inhibited by Rosiglitazone(PPARg agonist) in the rat aortic endothelial cells(RAEC).LPS-induced MMP-2 activation was diminished no matter exposure to NF-kB Activation Inhibitor II(JSH-23)or Ras inhibitor,farnesylthiosalicylic acid(FTS). Further study shows that LPS-induced activation of Phospho-Rho A and Phospho-MEKl/2 were significantly inhibited by Rosiglitazone.The activation of NF-kB p65 in the nuclear extract of cells was also significantly suppressed by Rosiglitazone, moreover,the expression of NF-κB p65 was partly activated by GW9662(PPARg antagonist).NF-kB DNA binding activity was also demolished by Rosiglitazone.In summary,our data showed that PPARg agonist,Rosiglitazone suppresses LPS-activated MMP-2 secretion via Ras-MEK1/2 signaling pathways and NF-kB activation.PPARg agonist and Ras-MEK1/2 pathway may be another potential therapeutic target for the disease induced by chronic inflammation.

Increased expression of matrix metalloproteinase-9 associated with gastric ulcer recurrence

AIM: To compare matrix metalloproteinase (MMP)-9 and tissue inhibitor of metalloproteinase (TIMP)-1 in gastric ulcer (GU) and chronic superficial gastritis (CSG). METHODS: This study enrolled 63 patients with GU and 25 patients with CSG. During upper gastroduodenal endoscopy, we took samples of gastric mucosa from the antrum and ulcer site from patients with GU, and samples of antral mucosa from patients with CSG. Mucosal biopsy tissues were cultured for 24 h, and the culture supernatant was measured for levels of MMP-9 and TIMP-1. After receiving eradication therapy for Helicobacter pylori (H. pylori ) and 8 wk proton-pump inhibitor therapy for GU, follow-up endoscopy examination was performed after 6 mo and whenever severe symptoms occurred. RESULTS: Levels of MMP-9 and TIMP-1 at the ulcer site or in the antrum were significantly higher in GU than CSG patients. MMP-9 levels at the ulcer site were significantly higher than in the antrum in GU patients, and had a significantly positive correlation with TIMP-1. MMP-9 levels were significantly higher in H. pylori -positive than H. pylori -negative GU and CSG patients. Levels of MMP-9 or TIMP-1 at the ulcer site were associated with the histological severity of activity and inflammation. About 57 GU patients were followed up, and seven had GU recurrence. H. pyloriinfection and MMP-9 levels were risk factors for the recurrence of GU adjusted for age and sex by multiple logistic regression analysis. CONCLUSION: MMP-9 may perform an important function in gastric ulcer formation and recurrence.

Association and prognostic significance of alpha-L-fucosidase-1 and matrix metalloproteinase 9 expression in esophageal squamous cell carcinoma

BACKGROUND Alpha-L-fucosidase-1(FUCA1)has been demonstrated to play opposing regulatory roles in adenocarcinoma and non-adenocarcinoma.Moreover,recent studies reported that FUCA1 could decrease the invasion capability by downregulating matrix metalloproteinase 9(MMP-9)expression.However,the potential role and prognostic significance of FUCA1 in esophageal squamous cell carcinoma(ESCC)have not yet been explored.AIM To evaluate the status,association,and prognostic value of FUCA1 and MMP-9 expression in ESCC.METHODS Patients who underwent esophagectomy for ESCC between January 1,2014,and December 31,2014 at Sun Yat-Sen University Cancer Center were enrolled.The expression status of FUCA1 and MMP-9 in cancerous tissues was detected using immunohistochemistry.In addition,the expression profiles of the FUCA1 and MMP-9 genes in non-metastatic ESCC were extracted from The Cancer Genome Atlas(TCGA)database.RESULTS High expression of FUCA1 and MMP-9 was found in 90 patients(75.6%)and 62 patients(52.1%),respectively.In the high FUCA1 expression group,the constituent ratios of patients with stage III disease(61.1%vs 37.9%,P=0.029),lymphatic invasion(62.2%vs 31.0%,P=0.003),and high MMP-9 expression(60.0%vs 27.6%,P=0.002)were significantly higher than those in the low FUCA1 expression group.In Kaplan-Meier univariate analysis,advanced tumor-nodemetastasis stage(III,P=0.001),positive regional lymph node metastasis(N+,P=0.002),high FUCA1 expression(P=0.001),and high MMP-9 expression(P=0.002)were potential predictors of shorter overall survival(OS),which was similar to the results analyzed based on the TCGA database.Further Cox multivariate regression analyses still demonstrated that FUCA1 and MMP-9 expression levels were independent prognostic factors of OS[hazard ratio(HR):0.484,95%confidence interval(CI):0.239-0.979;P=0.044;and HR:0.591,95%CI:0.359-0.973,P=0.039,respectively].CONCLUSION FUCA1 cooperation with MMP-9 may have a major role in affecting the ESCC invasion and metastatic capability,and serve as a valuable prognostic biomarker in ESCC.

芪地糖肾方对糖尿病肾病小鼠肾脏病变及血清Klotho、MMP-9/TIMP-1的影响

目的 探究芪地糖肾方对糖尿病肾病小鼠肾脏病变及血清Klotho、基质金属蛋白酶-9(MMP-9)/组织金属蛋白酶抑制剂-1(TIMP-1)的影响。方法 将36只14周龄db/db小鼠随机分为模型组、缬沙坦组、芪地糖肾方组,每组12只。选取12只14周龄db/m小鼠作为正常组。缬沙坦组给予10.29 g/kg缬沙坦水溶液灌胃,芪地糖肾方组给予3.33 g/kg芪地糖肾方颗粒水溶液灌胃,正常组及模型组给予等量的生理盐水灌胃,均1次/d,连续12周。免疫酶联吸附法检测尿微量白蛋白水平,计算12 h尿白蛋白水平;称小鼠体重、左肾重,计算肾重体重比值;免疫酶联吸附法检测血清Klotho、MMP-9、TIMP-1水平,计算MMP-9/TIMP-1;电镜、光镜下观察肾脏组织病理形态。结果 与正常组比较,模型组小鼠肾重体重比值、血清Klotho水平均明显降低(P均<0.05),12 h尿白蛋白水平及血清MMP-9、TIMP-1水平和MMP-9/TIMP-1均明显升高(P均<0.05),肾脏超微结构紊乱,肾小球基底膜明显增厚(P<0.05)。与模型组比较,芪地糖肾方组小鼠肾重体重比值明显升高(P<0.05),缬沙坦组升高不明显(P>0.05);缬沙坦组、芪地糖肾方组小鼠血清Klotho水平均明显升高(P均<0.05),12 h尿白蛋白水平及血清MMP-9、TIMP-1水平和MMP-9/TIMP-1均明显降低(P均<0.05),肾脏超微结构病变较轻,肾小球基底膜厚度均明显降低(P均<0.05)。结论 芪地糖肾方可明显减少糖尿病肾病小鼠尿蛋白,改善肾脏病变,其机制可能与调节血清Klotho及MMP-9/TIMP-1平衡有关。

MT1-MMP和PCSK9的联合抑制上调LDLR表达的研究

目的:探究Ⅰ型膜基质金属蛋白酶(MT1-MMP)和γ-分泌酶或前蛋白转化酶枯草溶菌素9(PCSK9)对低密度脂蛋白受体(LDLR)表达的影响。方法:应用DsiRNA分别沉默人肝细胞中MT1-MMP和PCSK9的表达并对细胞进行培养,选择DAPT抑制细胞中的γ-分泌酶,实时荧光定量PCR和免疫印迹法分别检测mRNA和蛋白质的表达水平。结果:MT1-MMP与γ-分泌酶或PCSK9的联合抑制可较单独抑制组进一步提高原代肝细胞中LDLR的表达水平;PCSK9^(-/-)小鼠再感染靶向小鼠MT1-MMP的shRNA腺相关病毒(AAV),会增加肝脏LDLR水平,降低血浆中的胆固醇浓度。结论:MT1-MMP和γ-分泌酶或PCSK9协同调节LDLR的表达。联合抑制MT1-MMP和γ-分泌酶或PCSK9可提高LDLR表达,并降低血浆中LDL胆固醇的水平,从而降低因现有手段无法有效控制血浆胆固醇水平的患者发生心血管病的风险。

Intracellular Transport of HIV-1 Matrix Protein Associated with Viral RNA

HIV-1 matrix protein (MA) is a multifunctional structural protein localized on N terminus of Gag precursor p55. MA participates in HIV-1 assembly as membranotropic part of Gag precursor as well as an individual protein spliced from Gag early in infection. MA is found in the nuclei of infected cells and in plasma membrane, the site of virus assembly, in association with viral genome RNA. MA mutated variant M4 which contains two changed amino acids in N-terminal regions is also associated with viral RNA, but it is localized in the nuclear and cytoskeleton fractions but not in the plasma membrane suggesting that the mutant is deprived of membranotropic signal and “sticks” in the nuclei an d cytoskeleton, its previous location sites. These data allow suggesting that MA involved into transmission of viral RNA is transported to plasma membrane by cytoskeleton.

MT1-MMP基因单核苷酸多态性与广西壮族绝经后女性骨质疏松的相关性

目的 研究膜型基质金属蛋白酶-1(MT1-MMP)基因单核苷酸多态性与广西壮族绝经后女性骨质疏松的关系。方法 用超声骨密度仪测量广西地区518例壮族绝经后女性左侧跟骨超声振幅衰减(BUA),并根据中国人骨质疏松建议诊断标准分骨量正常、骨量减少和骨质疏松组;MT1-MMP基因的4个单核苷酸多态性(SNP)位点(rs1003349、rs3751488、rs2236303和rs743257)的分型采用多重单碱基延伸SNP分型技术(Multiplex SNaPshot)。结果 4个位点单核苷酸多态性与BUA变异无相关性(P>0.05)。rs743257位点TT基因型在骨量减少组和骨质疏松组中的分布频率明显比骨量正常组低,CT基因型则相反;在对骨质疏松危险因素的有序Logistic回归分析显示,壮族绝经后女性个体携带rs2236303 CT基因型发生骨质疏松的风险比TT基因型的低(OR=0.532,95%CI:0.308~0.917,P=0.023),携带rs743257 CT基因型发生骨质疏松的风险比TT基因型的高(OR=1.873,95%CI:1.159~3.027,P=0.010)。结论 MT1-MMP基因rs2236303 C/T和rs743257 C/T的基因多态性可能与广西壮族绝经后女性骨质疏松相关,rs2236303 TT基因型和rs743257 CT基因型可能是增加骨质疏松风险的因素。

血清外泌体MT1-MMP mRNA在胃癌患者中的表达及其与预后的关系

目的 探讨血清外泌体膜1型基质金属蛋白酶(MT1-MMP)mRNA在胃癌患者中的表达及其与预后的关系。方法 选取2016年3月—2018年7月我院行胃癌切除术的98例患者为研究对象。采用实时荧光定量PCR(RT-PCR)测定患者癌组织、癌旁正常组织中MT1-MMP mRNA表达量,分析患者临床病理参数与胃癌组织中MT1-MMP mRNA表达量的关系;对98例患者进行随访,统计术后3年内存活率,比较存活亚组(n=62)与死亡亚组(n=36)患者入组时的胃癌组织与癌旁组织中MT1-MMP mRNA表达水平,运用受试者工作曲线(ROC)分析MT1-MMP mRNA表达水平对术后3年内生存状态的预测效能。结果 98例患者胃癌组织中MT1-MMP mRNA表达水平(0.96±0.12)显著高于癌旁组织(0.80±0.09)(P<0.05);患者胃癌组织中MT1-MMP mRNA表达量与淋巴结转移、浸润程度、TNM分期有关(P<0.05),与性别、年龄、肿瘤位置、肿瘤直径大小及分化程度无关(P>0.05);98例患者术后3年存活亚组入组时的胃癌组织及癌旁组织中MT1-MMP mRNA表达水平显著高于死亡亚组(P<0.05);ROC曲线分析显示,胃癌组织、癌旁组织MT1-MMP mRNA表达水平对患者术后3年生存状态的预测效能有一定局限性(AUC=0.760、0.691),胃癌组织与癌旁组织联合检验的预测效能明显高于单一检测(AUC=0.813)。结论 胃癌组织中MT1-MMP mRNA表达与肿瘤的淋巴转移、TNM分期及浸润程度相关,可一定程度上指导预后。

厄贝沙坦对高糖刺激的大鼠肾小球系膜细胞结缔组织生长因子及膜型基质金属蛋白酶-1表达的影响

目的研究血管紧张素Ⅱ受体1拮抗剂厄贝沙坦对高糖刺激的大鼠肾小球系膜细胞结缔组织生长因子(CTGF)和膜型基质金属蛋白酶-1(MT1-MMP)表达的影响。方法体外培养的大鼠肾小球系膜细胞,分别给予高糖和厄贝沙坦干预,采用RT-PCR及Western blot法分别检测CTGF和MT1-MMP的mRNA及蛋白的表达,用酶联免疫吸附法(ELISA)检测培养上清中Ⅳ型胶原的含量。结果与对照组相比,高糖组各时间点系膜细胞CTGF表达明显上调,Ⅳ型胶原的分泌增加,且二者随时间持续增高;而MT1-MMP的表达则随时间呈明显下降趋势。厄贝沙坦能够抑制高糖引起的上述变化。结论高糖可诱导肾小球系膜细胞CTGF表达增加,抑制MT1-MMP的表达。厄贝沙坦抑制肾小球系膜细胞基质分泌的作用可能部分通过抑制CTGF,增加MT1-MMP的表达而实现。

EBV-LMP1对鼻咽癌细胞系CNE1细胞转移相关因素的影响

背景与目的:已证实EB病毒(Epstein-Barrvirus,EBV)编码的潜伏膜蛋白1(latentmembraneprotein1,LMP1)能够诱导鼻咽癌细胞中基质金属蛋白酶9(matrixmetalloproteinase-9,MMP-9)的表达。本实验的目的是观察EB病毒潜伏膜蛋白1(EBV-LMP1)对鼻咽癌细胞系CNE1细胞转移相关因素的影响,探讨LMP1在鼻咽癌侵袭、转移过程中的作用。方法:用免疫组化法及Westernblot法检测CNE1-GL(转染LMP1基因的CNE1细胞)和CNE1细胞中MMP-9的表达情况;用细胞-基质粘附实验、细胞运动实验和肿瘤细胞重组基底膜侵袭实验检测LMP1对CNE1细胞粘附、运动及侵袭能力的影响。结果:免疫组化法及Westernblot法结果均显示CNE1-GL细胞中MMP-9的表达明显高于CNE1细胞(P<0.05);肿瘤细胞-基质粘附实验结果显示,CNE1-GL的粘附能力(平均吸光度值为1.2508±0.0711),高于CNE1细胞(平均吸光度值为0.9519±0.068),两者相比差异有显著性(P<0.01)。运动实验及重组基底膜侵袭实验结果均显示,穿过游离的聚乙烯吡咯烷酮膜(polyvinylpyrroli-done-free,PVP-F)的CNE1-GL细胞数明显高于CNE1细胞(P<0.01)。结论:LMP1能够诱导CNE1细胞中MMP-9的表达,且增强CNE1细胞与基底膜的粘附能力、运动能力及侵袭能力。

基质金属蛋白酶-9与转化生长因子-β1在胎膜早破患者胎盘胎膜中的表达

目的有研究提示基质金属蛋白酶(martix metalloproteinase,MMP)及其抑制物金属蛋白酶组织抑制剂(tissue inhibitor of metalloproteinase,TIMP)、转化生长因子(transforming growth factor,TGF)-β1在细胞外基质(extracellular matrix,ECM)降解过程中起着重要的作用,但MMP、TIMP和TGF-β1在胎膜早破(premature rupture of membrane,PROM)中的作用机制尚不明了。文中的研究目的为探讨PROM患者胎盘胎膜组织中MMP-9、TIMP-1和TGF-β1表达变化及意义。方法采用免疫组织化学SP法和Western blot印迹杂交法分别检测足月未临产择期剖宫、足月自然临产阴道分娩和足月PROM各28例孕妇分娩后的胎盘胎膜组织中MMP-9,TIMP-1和TGF-β1表达变化。结果免疫组化结果显示:①未临产组胎膜组织中MMP-9表达强度最低(P<0.05),临产组次之(P<0.05),PROM组最高(P<0.05),胎盘中MMP-9表达趋势亦同;②TIMP-1和TGF-β1表达趋势与MMP-9相反,未临产组胎膜组织中TIMP-1和TGF-β1表达强度最高(P<0.05),临产组次之(P<0.05),PROM组最低(P<0.05),胎盘中TIMP-1和TGF-β1亦然。Western blot结果显示:①未临产组胎膜组织中MMP-9表达量最低(P<0.05),临产组次之(P<0.05),PROM组最高(P<0.05),胎盘中MMP-9表达趋势亦同;②未临产组胎膜组织中TIMP-1和TGF-β1表达量最高(P<0.05),临产组次之(P<0.05),PROM组最低(P<0.05),胎盘中TIMP-1和TGF-β1亦然。胎盘和胎膜上TGF-β1表达水平与TIMP-1表达呈正相关,与MMP-9表达呈负相关。结论胎盘胎膜上TGF-β1表达降低,可通过调节MMP-9和TIMP-1的表达引起MMP-9/TIMP-1之间的比例失衡,使胶原降解加速,胎膜强度与韧性下降,从而导致PROM的发生。

高糖刺激下大鼠肾小球系膜细胞MMP-2，TIMP-2，MT1MMP 和CTGF的表达及意义

目的观察高糖刺激的大鼠肾小球系膜细胞基质金属蛋白酶-2(MMP-2)及其组织抑制物-2(TIMP-2)、膜型基质金属蛋白酶-1(MT1-MMP)和结缔组织生长因子(CTGF)的动态变化以探讨糖尿病肾病(DN)的发病机制。方法体外培养的大鼠HBZY-1肾小球系膜细胞分为低糖(5.5mmol/L葡萄糖)组、高糖(30mmol/L葡萄糖)组和渗透压对照(5.5mmol/L葡萄糖+24.5mmol/L甘露醇)组,24、48、72、96h后采用RT-PCR及Western blotting法分别检测MMP-2、TIMP-2、MT1-MMP及CTGF的mRNA及蛋白表达情况,酶联免疫吸附法(ELISA)检测培养上清中Ⅳ型胶原的含量。结果 Western blotting结果显示,与低糖组相比,高糖组MMP-2的表达在24h时略有升高,较低糖组增加10%±4%(P<0.05),至48h时则较低糖组减少42%±2%,其后随时间延长表达持续降低,至96h时较低糖组减少78%±2%;MT1-MMP表达在24h开始下降并随时间呈下降趋势,与低糖组相比较,在刺激的24h,高糖组MT1-MMP表达下降了29%±3%,随后持续下降,至96h则下降了78%±9%(P<0.01)。高糖组各时间点TIMP-2和CTGF表达均较低糖组增高,其中CTGF的表达在高糖刺激的24h即显著增高,为低糖组的201%±24%,随后持续增高,至培养96h为低糖组的484%±51%(P<0.01);TIMP-2的表达在24h时较低糖组增加55%±3%,且随时间延长呈增高趋势(P<0.01)。MMP-2、TIMP-2、MT1-MMP和CTGF的mRNA表达与相应蛋白的表达趋势基本一致。与低糖组相比,高糖组细胞上清中的Ⅳ型胶原于24h即有增加,且持续增高至96h(P<0.05)。低糖组和渗透压对照组组内、组间的各指标差异均无统计学意义。结论尽管高糖刺激早期可小幅诱导MMP-2的表达增强,但长期高糖刺激则可抑制MMP-2和MT1-MMP的表达及活化,同时促进系膜细胞TIMP-2和CTGF的表达。DN中肾小球细胞外基质的积聚可能是由于上述细胞因子和蛋白酶引起细胞外基质代谢失衡所致。

小鼠角膜碱烧伤行羊膜移植对MMP-9、TIMP-1在新生血管形成中的影响

目的探讨小鼠角膜碱烧伤行羊膜移植对基质金属蛋白酶9(matrixmetalloproteinase9,MMP9)、金属蛋白酶组织抑制剂1(tissueinhibitorofmetalloproteinase1,TIMP1)在新生血管形成中的影响以及MMP9及TIMP1在角膜新生血管形成中的作用。方法昆明小鼠40只,随机分为实验组和对照组,每只鼠均取右眼为实验眼。采用1mol·L-1NaOH溶液烧伤小鼠角膜,建立炎症性角膜碱烧伤动物模型。对实验组小鼠右眼角膜行羊膜移植,对照组不行羊膜移植。分别在羊膜移植后的0d、2d、7d、14d处死2组小鼠,摘除右眼球,行免疫组织化学染色并用计算机图像分析系统检测2组小鼠MMP9及TIMP1在角膜中的分布及其平均吸光度值的变化。结果免疫组化结果:对照组碱烧伤角膜后第2d,可见MMP9出现表达,第7dMMP9的染色较第2d增强,基质层可见大量新生血管,且血管内皮细胞可见表达,14d达高峰;TIMP1开始表达不明显,第7d出现表达,14d达高峰。羊膜移植组各时间点MMP9表达低于对照组,而TIMP1表达高于对照组。结论碱烧伤后小鼠角膜中MMP9表达增加,在新生血管形成的过程中起一定作用。羊膜可能具有抑制MMP9在碱烧伤小鼠角膜中表达的作用,而且羊膜同时促使TIMP1在后期表达水平升高,从而抑制MMP9的活性,抑制和减缓碱烧伤后角膜新生血管的发生和发展。